Final answer:
Orrorin tugenensis characteristics suggest bipedalism and a close relation to modern humans due to its large femoral head, thick dental enamel, and small square molars.
Step-by-step explanation:
The characteristics of Orrorin tugenensis, a species found in Kenya in 2001, suggest that it may be an ancient ancestor to modern humans. One important feature of Orrorin is the large femoral head, indicating that the species was likely bipedal and used its femur to support its upper body weight which is a trait associated with hominins. Moreover, Orrorin had thick dental enamel and small, square molars resembling those of modern humans, further supporting the hypothesis that it could be a human ancestor.